# Re: Advice on user space application integration with tc

- From: Cong Wang \<hidden\>
- Date: 2017-05-16 17:22:51 
- List: netdev
- Page: https://ratatoskr.run/netdev/2017/05/11054145
- Thread: https://ratatoskr.run/netdev/2017/05/11054145/t.md

```text
On Mon, May 15, 2017 at 1:33 PM, Morgan Yang [ref] wrote:
> I tried on both stock CentOS 7.3 and Ubuntu 16.04 and tc-skbmod was not
> support (I built tc from the latest versions of iproute2). For tc-pedit,
> examples from man tc-pedit such as "pedit ex munge" were not supported, but
> "pedit munge offset" is.

act skbmod is new, it is introduced by:

commit 86da71b57383d40993cb90baafb3735cffe5d800
Author: Jamal Hadi Salim [ref]
Date:   Mon Sep 12 20:13:09 2016 -0400

    net_sched: Introduce skbmod action

For pedit, "ex", as it implies, it is an extended feature which was
introduced in:

commit 71d0ed7079dffbc5cd0941d77d9b84e04109c9bb
Author: Amir Vadai [ref]
Date:   Tue Feb 7 09:56:07 2017 +0200

    net/act_pedit: Support using offset relative to the conventional
network headers
```